Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
are you noticing any drivability issues or do you notice a misfire yourself? also what size engine do you have in this suburban?
ok thank you for that information. these vehicles have a number of different issues that can cause this in particular. how many miles are on this vehicle?
the most common failure on those engines with AFM is the valve lifters. although i would pull a spark plug and check its condition first. make sure they are new plugs in there. or at least seem to match the condition of the heads.
they may not make noise but they dont operate properly for the AFM. common failure point is the cam sensor but i would still check the pulgs first. do you have a scanner by chance? or anyway to do a power balance test?
is it capable of monitoring data?
what you will want to do is find where you can see misfire data and while it is running see which cylinder is generating the most misfires while running. it is possible for only one cylinder to misfire and it though a code for random.
sounds good let me know what happens